The sol-gel auto-combustion method and the sonochemical co-precipitation method were used to prepare Ba0.5Sr1.5Zn2Fe12O22 (S1) and partially Al substituted Ba0.5Sr1.5Zn2Al0.08Fe11.92O22 (S2) powders. The XRD analyses show that the samples are single-phase Y-type hexaferrite. SEM images of the S1 sample obtained by auto-combustion revealed particles of a very non-uniform shape and well-agglomerated to form clusters of different sizes and shapes. in contrast, the particles of the samples obtained by sonochemical co-precipitation had the perfect hexagonal shape typical for Y-hexaferrite of an estimated size of 1.2 μm and an average thickness of 168 nm. We report magnetic structure determination from patterns of the samples at 5 K and 300 K and the magnetic order evolution by temperature-dependent diffraction taken on SPODI (MLZ) between 10-350 K in the heating and cooling runs using a cryostat with a closed cycle refrigerator.